ADF Customer Maintenance

Question

After doing the browse and edit pages, I have proceeded to do the Create button and the DBSequence. Now when the application is tested, I have the following messages...
Validation Error
You must correct the following error(s) before proceeding:
JBO-26041: Failed to post data to database during "Insert": SQL Statement "BEGIN INSERT INTO OE8.CUSTOMERS(CUSTOMER_ID,CUST_FIRST_NAME,CUST_LAST_NAME,CREDIT_LIMIT) VALUES (:1,:2,:3,:4) RETURNING CUSTOMER_ID INTO :5; END;".
ORA-01400: cannot insert NULL into ("OE8"."CUSTOMERS"."CUSTOMER_ID") ORA-06512: at line 1
I have tried to go back to the customer attributes and make corrections but to no results...
Any help please?

Answer 1

When you use a DBSequence data type, it's assumed that your table has a BEFORE INSERT FOR EACH ROW trigger on it what will assign the sequence number for that attribute using a database sequence.
Does your CUSTOMERS table have such a trigger?
If not, assuming your sequence was named CUSTOMER_ID_SEQ you would write the trigger like this:
create or replace trigger assign_customer_id_seq
before insert on customers for each row
begin
  select customer_id_seq.nextval into :new.customer_id from dual;
end;
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